One of the best sources of information is the book Running a Biogas Programme: A Handbook by David Fulford which is available from Practical Action Publishing.
Another very useful publication is Improved Biogas Unit for Developing Countries GTZ, (now GIZ) 1991, 98 p. by Ludwig Sasse, Christopher Kellner, Ainea Kimaro. It describes the technology used by CAMARTEC (Centre for Agricultural Mechanization and Rural Technology) with the support of the GTZ Biogas Extension Service in Tanzania. This book and many other publications are available on the United Nations Development Programme CD Energy for Sustainable Development Library.
GTZ (now GIZ) The German Development organisation has produced a whole range of practical guides to biogas technology in developing countries
• Biogas Plants in Animal Husbandry (Contains a section on Fertilizing with Digested Slurry)
• Biogas Plants
• Improved Biogas Unit for Developing Countries
• The Purification of Biogas
• Dissemination of Biogas Plants in the Rural Areas of Kenya
• Biogas Basics

Neil Philip Noble said:

neilnoble said:

There are a few suggestions of what can be done if your biogas unit is not working in the brief Using a Biogas Digester which was originally written by the Practical Action office in Sri Lanka. Also have a look at the Sri Lankan website Janathakshan.

Shelf said:

said:

I'm glad that I've found your practicalaction.org site. I realize that you are an expert at your work! I am launching a website soon, and your info will be very useful for me.. Thank you for all your efforts and wishing you the success in your business.